CNC machined stainless steel parts can be oxidized to improve their appearance and corrosion resistance. Here are the detailed steps:
Preparation:
Prepare CNC machined stainless steel parts, ensuring surfaces are smooth, clean and free of dirt, grease or cutting residue.
Degrease:
Before oxidizing, parts must be degreased. This can be done by solvent washing, alkaline cleaners or ultrasonic cleaning.
After cleaning, the parts should be washed and dried to ensure no residue remains.
Pickling:
Stainless steel parts are etched to such an extent that scale and other contaminants are removed from the surface. Typically an acid solution such as nitric acid or phosphoric acid is used, with the appropriate acid selected depending on the part type and requirements.
Oxidative treatment:
Stainless steel parts are soaked in an oxidizing solution to create an oxide layer. The oxidation process uses electric current and a special electrolyte to control the oxidation rate and layer thickness.
The holding time and temperature of the parts must be precisely controlled to ensure the desired properties of the oxide layer.
Color (optional):
If desired, color can be applied over the oxide layer to change the appearance of the part. This is usually done using organic dyes or pigments.
seal:
After completion of the oxidation treatment, stainless steel parts must be sealed to prevent the oxide layer from falling off or corroding.
Sealing is usually done using a hot dip coating or sealant.
Cleaning and inspection:
Clean any residues from oxidized and sealed parts.
Carefully inspect surfaces to ensure they meet required appearance and performance standards.
Tested and verified:
Test and perform performance checks on oxidized stainless steel parts to ensure they meet specifications.
Oxidation treatment can improve the appearance and texture of stainless steel parts, as well as improve their corrosion resistance and wear resistance. When carrying out oxidative treatment, attention must be paid to safety and environmental protection, and relevant regulations must be strictly followed. Various oxidation methods and processing parameters can be adjusted according to the requirements of the part.